1. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

2. Who invented Printing Press ?

Answer:

Johannes Gutenberg

3. Who invented Java Language ?

Answer:

James Gosling

4. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

5. Who invented Helicopter ?

Answer:

Igor Sikorsky

6. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

7. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table